Checked in on reddit while I pooped, and had a heap of private messages saying I was banned from all these subreddits.
Wondered wtf since I haven't in anything except /r/brisbane in months, but realised it was because I ran Redact the other day and it's edited/deleted all my old comments. The automod on a heap of subreddits doesnt like that, so even if you delete a post from 2011 they'll ban you.
To do that you have to request your data, choose GDPR, choose full time, and download the zip file. Can only do it once per 30 days, but its worth doing a couple of times as it seems to find more info each time.